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- W2040373090 abstract "Chemical oxidation in acetonitrile of the previously reported phenolato-bridged binuclear Mn(II) complex [(mL)MnMn(mL)]2+ (1), where mLH is pentadentate N,N′-bis-(2-pyridylmethyl)-N-(2-hydroxybenzyl)-N′-methyl-ethane-1,2-diamine ligand [C. Hureau, et al., Chem. Eur. J. 2004, 10, 1998–2010] using iodosylbenzene PhIO (dissolved in methanol) is described. The addition of one to four equivalents of PhIO per Mn ion leads to the transient formation of the mono-μ-oxo binuclear Mn2(III,III) complex [(mL)Mn(μ-O)Mn(mL)]2+ (2), previously studied. After addition of five equivalents of PhIO per Mn ion, the mononuclear Mn(III) species [(mL)Mn(OMe)]+ (3) is quantitatively generated. The UV–Vis spectrum of 3 displays a broad band at 456 nm (ε = 1000 L mol−1 cm−1) attributed to phenolato to Mn(III) charge transfer transition. Complex 3 exhibits a reversible oxidation wave at E1/2 = 0.68 V versus SCE, and the mononuclear Mn(IV) complex [(mL)Mn(OMe)]2+ (3ox) can thus be generated by exhaustive electrolysis at 1.0 V versus SCE. The 9.4 GHz EPR spectrum of complex 3ox shows a strong transition near g = 4 consistent with a rhombically distorted S = 3/2 system with a zero-field splitting dominating the Zeeman effect. UV–Vis spectrum displays a large phenolato to Mn(IV) charge transfer transition at 670 nm (ε = 2450 L mol−1 cm−1)." @default.
- W2040373090 created "2016-06-24" @default.
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- W2040373090 date "2006-01-01" @default.
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- W2040373090 title "Chemical access to the mononuclear Mn(III) [(mL)Mn(OMe)]+ complex (mLH=N,N′-bis-(2-pyridylmethyl)-N-(2-hydroxybenzyl)-N′-methyl-ethane-1,2-diamine) and electrochemical oxidation to the Mn(IV) [(mL)Mn(OMe)]2+ species" @default.
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- W2040373090 doi "https://doi.org/10.1016/j.ica.2005.10.038" @default.
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